<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户存在</title>
</head>
<body>
    <center>
        <h1>该用户已存在！</h1>
        <a href="./register.html"><input type="submit" value="重新注册"></a>
    </center>
</body>
</html>